Improvement in bark-mills



J. HELEN-BROOK.

Bark Mill.

Patented Feb. 14, 1871.

I n' I I VVicnesseL l 1 Inventgr;

il 1 M4 WWW n4 PEIERS, PHOT LHMOGRAFHER WASHINGTON D c turn cm JOHNHELENBROOK, 0F OLEA N, YORK.

Letters Patent No.-111,-744, dated February 14, 1871.-

.IMPROVEMENT lN BARK-MILLS.

The Schedule referred to in these Letters Patent and making part of thelame.

To all whom it mdy concern Be it known that'I, J OHN Hutnmsnook, ofClean, in the county of Oattaraugus and State of New York, have inventedcertain new and useful Improvements in Bark-Mills; and the following .isa full, clear, and exact description of the same, reference being bad tothe accompanying drawing makin' g a part of this specifioation, in whichi Figure 1 represents a plan or top view of the hopper,- breaking,brushing, and grinding apparatus.

Figur -e2 shows a sectional view through the mill, with the arrangementof all the working parts and theirrelation to each other foroperating,"as hereafter more fully described.

The object and nature of my invention are to break up, crush, and grindbark for tanning purposes and It consists in the inclined pronged sweepfor breaking up-and feeding in the bark.

General Description of Parts. 1 The hopper A A, which surrounds thebreaking,

crushing, and grinding mechanism, andreceives the bark to be ground, maybe made of cast-iron ornf wroughtsheet metal, and may be supported onand secured to'the frame-work of the building or on a separate framefasmay be desired.

The stationary portion of the crushing-"and grind-' ing mechanism issecured within the hopper A A, and it consists of bars, .B B, forming aright-angle frame, the center of which forms the journal-box O for theupper end of the vertical shaft D to ruu iu.

The bars B B are providedwith prongs, b ,b, pro jecting upward fromtheir surfhce, which are a part of the breaking mechanism.

On the under side of the bars B B are lugs or prongs, d d, projectingdown, to which the series of circular, cone-shaped, notched, or serratedstationary grinding-rings E E is secured, and held firmly to the framein the lower portion of the hopper A A.

The corresponding series of rotating rings, F F, is notched or serratedin the same manner as the stationary grinding-rings E Er and may be caston orsecured to the arms G G. at such a position as to fit nicely in thespaces between the stationary rings E E, so that the barkis ground orpulverized on both sides of the cone-rings in all of the spaces.

The arms G G are provided with lugs, .g g, on the underside, by whichthe cone serrated rings h F are rotated by the action of the clutch h onthe shaft 1), which will admitof the series of rings F if being nnovedup or down on the shaft, so, as to grind the bark coarser or finer, asmay be desired.

On the upper edges of the rotating rings or bars F F is a series of thepurpose of breaking strips of bark so that it will readily feed in to bepulverized after it is broken up coarsely by the revolving sweeping armK, which is secured to the vertical shaft D above the frame B B.

One arm of the sweep K is inclined. upward on an angle of about fivedegrees, and is provided with prongs, cc 0, on its"under side, whichpass between the projecting prongs b b on the upper side of the bars BB, to crush and break up the bark so that it will readily feed in to bemechanism beneath it.

The sweep K is also provided with sharp angular ground or pulverized bythe projections, k i k, to aid in breaking up the bark and.

prevent it from being forced out against the outer portion of thehopper, and to give great durability and eiiiciency.

'lhe lower portion ofall of the cone-shaped serrated annulargrinding-rings E and F 'is cast on a chill and rnade --very hard; ortempered steel serrated bands, 13 i 't i, may be fitted on the bottomsof the rings or bars of, both the stationary and rotating grinders E Eand F F, asshowu in fig. 2, sothnt they can be taken off and sharpened,come worn and dull by use. g

What I claim as my improvements is- In the bark-mill herein described,the arrangement of the sweep K, with one of its arms elevated andprovid'ed with projections 7t 7.: and prongs c c c, in combination withthe frame-bars B B, provided with. prongs b1), when all the parts areconstructed and arranged as shown and described, for the purposes setforth.

In testimony whereof I hereunto subscribe my name in the presence of twowitnesses.

JOHN HELENBROOK.

Witnesses JOHN Somsunnn, O. S. STOWELL.

projecting booked prongs, f f j; forshould they be-

